When you access the BSD Tool to define a new business system or view or change an existing business system, CA Gen displays the unexpanded activity hierarchy associated with the current model. You must expand the hierarchy to work in the hierarchy, as shown in the following figure.
On the BSD screen, processes that are already included in the selected business system are displayed in yellow with a black background. Elementary processes that are already included in a different business system are displayed in white with a black background. Elementary processes not included in a business system are displayed in white on a blue background.

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